Based on the amounts of taxable income below, compute the federal income tax payable in 2013 on

Question:

Based on the amounts of taxable income below, compute the federal income tax payable in 2013 on each amount assuming the taxpayer is married filing a joint return. Also, for each amount of taxable income, compute the average tax rate and the marginal tax rate.
a. Taxable income of $30,000.
b. Taxable income of $100,000.
c. Taxable income of $375,000.
d. Taxable income of $600,000.